{"product_id":"oem-lennox-heat-exchanger-33m14","title":"OEM Lennox Heat Exchanger — 33M14","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33M14\u003c\/strong\u003e heat exchanger is the core combustion component of your Lennox gas furnace, transferring heat from burned fuel to the air circulating through your home while keeping combustion byproducts safely separated from the breathable airstream. Engineered to the exact metallurgy, tube geometry, and pressure tolerances of your Lennox unit, the \u003cstrong\u003e33M14\u003c\/strong\u003e restores rated heating output and safe operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Cracks or corrosion in a heat exchanger often show up as a flickering or rolling burner flame, soot or rust streaks, a persistent \"hot metal\" or chemical odor, unexplained CO detector activation, or a furnace that repeatedly shuts down on the flame-rollout or limit switch. Any suspected crack is a carbon-monoxide safety hazard and warrants immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The heat exchanger is a life-safety part. Aftermarket or universal substitutes rarely match the wall thickness, weld quality, and dimensional fit Lennox specifies, risking premature cracking and CO leakage. The factory \u003cstrong\u003e33M14\u003c\/strong\u003e guarantees a proper seal to the burner box and collector, correct clearances, and full compatibility with your Lennox furnace — protecting both efficiency and your family's safety.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108767091,"sku":"LNX-33M14","price":399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-heat-exchanger-LNX-33M14.jpg?v=1783761896","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-33m14","provider":"National HVAC Parts","version":"1.0","type":"link"}